Posterior Thigh Muscles (Quiz/Exam 3) Flashcards
Muscles of the posterior thigh are __________ of the hip and _______ of the knee. These muscles are the hamstrings
extensors, flexors
What are the hamstring muscles?
1) semitendinosus
2) semimembranosus
3) biceps femoris (short and long head)
What is the origin of the semitendinosus?
ischial tuberosity
What is the insertion/distal attachment of the semitendinosus?
superior part of the medial surface of the tibia
What innervates the semitendinosus?
tibial division of sciatic n.
What are the actions of the semitendinosus and semimembranosus?
-extend thigh
-flex leg
-rotate leg medially when knee is flexed
-when thigh/leg are flex, then the trunk can be extended
What is the origin/proximal attachment for the semimembranosus?
ischial tuberosity
What is the insertion/distal attachment for the semimembranosus?
test q
posterior part of medial condyle of the tibia (reflected attachment forms oblique popliteal ligament to the lateral femoral condyle)
What innervates the semimembranosus?
tibial division of sciatic n.
What is the origin/proximal attachment for the long head of the biceps femoris?
ischial tuberosity
What is the origin/proximal attachment for the short head of the biceps femoris?
linea aspera and lateral supracondylar line of the femur
What is the insertion/distal attachment for the biceps femoris?
lateral side of head of fibula (tendon is split at this site by fibular contralateral ligament of knee)
What innervates the long head of the biceps femoris?
tibial division of sciatic n.
What innervates the short head of the biceps femoris?
common fibular division of sciatic n.
What are the actions of the biceps femoris?
-flexes leg and rotates leg laterally when knee is flexed
-extends thigh when you first begin walking
